Dynamo-mounting.



J. I'. MOBLROY.

DYNAMO MOUNTING.

APPLIATION FILED FEB. 21, 190B.

83, l 58 Patented Jan.31, 1911.

3 SHEETS-SHEBT 1.

983,158., Patented Jan. 31, 1911.

J. F. MUELROY.

v DYNAMO MOUNTING.

APPLIOATION FILED 1113.21, 190s.

3 SHEETS-SHEET 2.

yllnle EEE J. F. MOBLROY.

DYNAMO MOUNTING.

APPLIoATIoN FILED 1113.21, 1908.

3 SHEETS-SHEET 3.

Patented Jam.v 31, 1911.

same time the tendency of the dynamo to its vFig. 3 a side viewthereof.; lFig. i shows the detail.

axle of the ear-wheel, journaled in the ordi'u JAMES fr?, .lQoELRUi-",ALBANY, NEW YQRH, ASSXGNGR, Bf MESNE SSGNELENTS,

THE UNTED LEGHE" fr HEATHG CPAEY, @F NEVI YGRK, 'N'. Y.,

vSpecification of Letters Patent.'

DYNAMO-EKOUNTNG.

Patented Jan, 335i, ddii.

.application niet?. February 2l, 190%. Serial Ho. 417,003.

To all whom it 'may concern.

Be it known that l, dairies l?, MCELROY, a citizen of the United States,residing in the city oi Albany, countylo Albany, State or'l New York,have invented certain new and useful improvements in Dynamo-Mounting,ot' which the following specification and accompanying drawingsrepresent that form which l now regard as the best of the various formsin which the terms and substance of the invention may be embodied.

ln the drawings, Figure l is a plan view of my invention; Fig. 2 an endView theroit';

My invention relates to the mounting of dynamos upon railway vehicles,and particularly to such mounting of the dynamo that it may bedrivenfrom one oi'- the caraxles by means of a belt.

ln particular, l so mount the dynamo that it may be adjusted bodily toand from the car-axle, and, moreover, provide for it a self-adjustingtension device, by means of which the tension on the belt is maintainedsubstantially uniform in spite ot variations 1n the length of the beltby stretching or other causes. l also mount the dynamo upon a pivotalsupport, the axis of rotation of the dynamo being Within the body ofthedynamo itselr", whereby the aforesaid tension device may take up slackin the belt and at the swing upon its supports under sudden shocks ispractically eliminated. l also split the dynamo casing at the top andbottom and hinge one haltl thereof so that it may open outwardly on theside et the machine from the car-axle. ln this same hallB ot the dynamocasing l also provide a door hinging on nearly a vertical line, so thatit may be opened outwardly and nearly 'in a horizontal direction, topermit ready access to the interior oii the casing.

The foregoing features, together with others to be herematter described,will form the subject-matter of the claims hereinafter stated.

Turning to the drawings, i represents the nary manner in a truck, thetransverse beams or which are indicated at B and C, and the longitudinalbeams of which intheatedl at D, D, D2, D3 (see Fig. l). Upon the endbeam B and projecting rearwardly therefrom are two bracket arms E and E.At their inner extremities these brackets are bolted to the under sideof the beam C (see Fig. 3). From this point they pass upward toward therear and rest upon the top side of the beam B, to which they are securedby clamps c and e. The rear or outer ends 0i' these brackets areprovided with brace bars F and F', which extend. from the extremities ofthe brackets in an outward direction, as appears in F ig. 1, and at thesame time in a downward direction, as appears in Fig. 2, to the beam B,to which they/are bolted.

Between the two bracket arms E and E the dynamo G is supported at apoint outside of the truck beam B in the following manner. 'lo the underside of the dynamo, and parallel to the dynamo shaft, is bolted a bar H,the ends of'which are bent up'ward (see Fig. 2) to a point slightlyabove the axis ot the dynamo. A similar bar E; is bolted on the insideof the dynamo adja# cent to the beam B, the ends of this barbeing turnedinwardly, as appears in Fig. and bolted to the bar H. The two extremities or" the bar H are bolted to sliding loo-ps K and l, which embraceand slide upon the respective bracket bars E and E. llhese loops areadjusted in position 'along the bracket bars, and are secured thereto ata desired point by means of bolts 7e and fr', which pass through the twosides of the loop and through ay hole in the bracket bar einbraced bythe loop.` By this means the dynemo, which is pivotally suspended fromthese loops, is given an approximate adjustment with respect to thecar-axle. 'lhe connection between the aforesaid loops and the respectiveextremities orP the hanger bar H is secured by means of the bolts L andL',

the axis ot these bolts being the airis 'of the bodily rotation of thedynamo. lt should be observed at this point that this axis of rotationis within the body oi" the dynamo and is as close to the center orgravity thereoiE as is consistent with the tensioning of the belt by themeans to be hereinafter described. The purpose of this is to reduce thetendency of the machine to swing to and iro under the impulse given bythe sudden starting oit the cars in one direction or the other and thebumping against/ other cars', and similar causes. Of course, if thedynamo were suspended exactly at the center of gravity, such shockswould have no effect toward causing the dynamo to rotate on itssupports-in other. words, its suspension would be neutral with'respectto shocks of that kind. It is my object to approximate as closely aspossible to this neutral support by vmounting the pivots upon which'thedynamo hangs as nearly to the center as may be permissible under thecircumstances.

The dynamo being Vpivotally mounted, as above described, a belt S isprovided, which connects the drive pulley S on the car-axle A with thesmaller pulley S2 on the shaft of the dynamo. @n the sliding loop Knearest to the belt S and at the'end of the loop farthest from the car lplace a downward projection K2 (see Fig. 3). To the lower extremityv ofthe projection K2 l pivot one end of the spring guide W, the other endof which is attached to abraclret "V bolted to the bar H', which in turnis bolted to the casing of the dynamo.. rlhe spring guide W is made withtwo telescoping portions with a spring between 'them whichobviouslytends to draw the dynamo in a direction away from the truck and towardthe aforesaid projection K2. The tension of! the spring, therefore,tends to rotate the dynamo bodily around a center coincident with 'theaxis of the supporting bolts L and to thereby put the belt S undertension.

Referring particularly to Fig. 3, it will be` manifest on inspectionthat as the belt becomes slack the tension of the spring will tend Vtodiminish, but at the same time the horizontal` axis of the spring willdrop as the dynamo rotates around the bolt L.

'l`herefore,` although the tension of the spring would be somewhatdecreased, yet it will act on a longer lever arm with respect to thebolt L as a fulcrum. Conversely, if the belt is tighter and short-er thehorizontal axis of the spring will rise nearer to the bolt L andthereby, although its tension is in'- creased, it will act upon ashorter lever arm with respect to the axis of the bolt of the fulcrum.By this arrangement the'spring will always exert substantially the sametension upon the belt regardless of the length of the belt and thedistance between the eenJ ters of the two pulleys.

It will be manifest that the result of my construction as thus Afardescribed is to relieve the belt from all unequal strains. For example,the above described hanging of the dynamo upon the axis of the rotationlying within the body of the dynamo relieves the belt from the suddenand excessive strains which would result if the dynamo were pivoted at apoint either above 0r below it. In such case a shock tending to swingthe dynamo away from the truck esente would produce a sudden andabnormal strain on the belt, 1whereas. a s hocl.: tending to swing thedynamo toward the truck would first slacken up the belt but the reboundto the action of the spring would produce a heavy blow on the belt,tending to snap it in two. Moreover, by means of the selfadjustingtension device above described, 'the belt is kept equally taut, in spiteof any stretching, so that it need not be given an undue degree oftension when it is first ap plied, inorder to prevent it from .slippingafter it has become slightly stretched. l am also enabled by theadjusting of the aforesaid sliding loops along the bracket arms to kinsure that the shaft of the dynamo will be parallel with the car-axleat all times, there being the same number of adjusting holes in each ofthe brackets, these holes being located in respectivevbraclets at equaldistances from the canelle. By this means l avoid the necessity oftightening the belt by minute gradations in the bodily position of thedynamo itself with respect to the caraXle. l give the sliding loops alined and definitev advance along the brackets, either toward or fromthe car truck, by delinile and comparatively long steps and then securetheml positively in position, the tension being then taken care of inthe way l have described by means of the self-adjusting spring. This notonly enables the beltto ru'n true by maintaining the dynamo shaftparallel to the car-axle, but also avoids the necessity for cutting oifa section of the belt and relacing it to shorten itafter it becomesstretched `to a considerable degree. Ylt is only necessary in myconstruction to set the sliding loops baclr to the next hole and securethem in place, the tension device aforesaid talring care of the smallerdegrees of adjustment. The tension of the belt is also not dependent onscrewing the dynamo bodily back and forth as in some adjustingarrangements.

Qver each one ofthe sliding loops l and K l provide a guard loop X X(see particularly Fig. et), the two ends of which are bolted to theinturned-end portion of the bar H. By this means the loss of one or bothof the main hanger-bolts L and L will not cause the dynamo to drop outou the track and derail the train. At the same time the braces F und ll"will prevent 'the sliding loops escaping from the ends of the bracketbars E and fdl. These guard loops may be said to span the main hangerbolts in that they forni a supplementary connection around those boltsbetween the dynamo on the one hand andthe bracket bars on the other.

The casing of the dynamo is split into two parts on an approximatelyvertical line, the two parts being hinged together near the bottom atYthe point Z (see lfig. 3) und llO las

brought together at the top, being held together by the bolts e, Figs. land .9..r By thls meansl the rear half of the dynamo casing may be swungoutwardly and the armature removed by slacking up the belt and liftingit from the pulley S2. Moreover, in the. said removable half of thearmature casing is a door P lying in a slightly' inclined plane andhinged so as to open outwardly to permit of the easy inspection of theinterior of the dynamo. A similar door J hinged at the top of themachine on 'a horizontal axis, is provided at the lett of the door B andserves to give access to the mechanism which reverses the dynamoconnections on the reversal of the direction of rot-ation.

My invention is primarily desi ed for anelectric-lighting dynamo driveny a caraxle, but may also be employed in the event of the dynamo servingas a motor to drive the axle While my mode of tensioning the belt may beemployed in any situation wherein a dynamo whether acting as a generatoror as a motor is belted to an axle, which term is in this respectinclusive of a. shaft of any appropriate kind.

Whatl claim as new and desire to secure by Letters Patent is:

1. The combination with an axle, of a dynamo belted thereto, means foradjusting the dynamo to and from the. axle by definite ste s andsupplementary means for automatica ly maintaining air substantiallyconstant spring tension von the' belt.

2. The combination with an axle, of a dynamo belted thereto, a,supporting bracket, means for adjusting the dynamo at denite pointsalong the bracket, a rotatable mounting for the dynamo, and means foradjusting the tension of the belt by movement of the dynamo around itsaxis of rotation.

3. The combination with an axle, of a dynamo belted thereto, a supportfor the dynamo movable to and from the axle by equal definite steps atboth ends, means for mounting the dynamo rotatably in said support, anda spring tendina to rotate the dynamo upon its support or maintaining`the tension of the belt.

4. The combination with an axle of a dynamo belted thereto, a supportfor the dynamo adjustable to and from the axle, means for securing thesaid support at definite oints, and a spring tending to rotate the ynamowithlrespect to the said support tor imposing'tension onthe belt.

5. rEhe combination with an axle, of a dynamo belted thereto, anadjustable support for the dynamo upon which the dynamo is rotatablymounted, and a self-adjusting sprin for imposing a substantiallyconstant tension on the belt.

6. rlhe combination with an axle, of a .dynamo belted thereto, anadjustable support for the dynamo upon which' it is roat the other end.tothe dynamo in a linceccentric to the axis of rotation of the dynamo. L

7. The combination with an axle, of a l dynamo belted thereto, a supportfor the dynamo upon which it is rotatably mounted, and a spring tendingto rotate the dynamo on its support and act-ing alonga lineeccentricwith respect to the axis of the rotation of the dynamo butchangeable in position with respect to such axis, whereby the leverageof the spring varies substantially inversely as its tension.

8. The combination with an axle, of a dynamo belted thereto, a supportfor the dynamo upon which it is rotatably mounted, a spring tending torotate the dynamo around its axis of rotation in a direction away fromthe axle, and a pivotal mounting for the spring whereby the line ofaction of the spring varies as the dynamo is rotated on its axis toincrease its leverage as the dynamo recedes from the axle.

' 9. rI`he combination with an axle, of a dynamo belted thereto, asupport for the dynamo upon which it is rotatably mounted, a springtending to rotate the dynamo on its axis, and connections for the springpermitting it to act upon thedynamo on a changing leveragel increasingas the belt slackens as the dynamo is drawn farther from the axle.

. 10. The combination with an axle, of a dynamo` belted thereto, asupport for the dynamo upon which it is rotatably mounted, the axis ofrotation of the dynamo on its support being vwithin the body of thedynamo and approximately atv its center of gravity, and means forimposing tension on the belt by pressure tending to rotate the dynamoupon its support. y 11. The combination with an axle, of a dynamo beltedthereto and located at one side of the axle, an adjustable support upon.-which 'the dynamo swings upon' an axis lying Within the body ot thedynamo approxi-A mating in positiontofthe center of gravity thereof, andmeans for tensioning the belt by pressure tending to swing the dynamoupon its supporting' axis.

l2. The combination with an axle, .of a dynamo belted thereto, a supportfor the dynamo at one side of the axle upon which the dynamo swings andwhich is adjustable by definite steps to and from the axle, and atension spring anchored at one end to the said support and connected tothe dynamo at the other end and tending to tension the belt by pressureacting eccentrica-ily to and at varying distances from the axis ofsuspension of the dynamo.

13. The combination with an axle, of a dynamo belted thereto, horizontalsupportingvln'acketsfor tlie dynamo. supports adjustable along saidbrackets and upon which the dynamo is rotatably mounted, and aseifadjusting spring connected at one end to one of lie said supportsand at tlie other end to the dynamo and acting to tension the belt byrotating the dynamo upon its supporting' axis.

14e. Trie combination with a car axle, oi a dynamo mechanicallyconnected thereto at one' side of the axle and having its casing splitat top and bottom, so as to open outwardly on that side vof the dynamoaway from said axle.

15. The combination with a. car truck of overhanging brackets projectingoutside tne truck axle and a dynamo mounted 'on said brackets and havingits casing split at top and bottom in a line tlirouglihe journal axis soas to open outwardly on the side away :trom tlie truck.

1G., The combination with a car axle5 of dynamo having a drivingconnection there with, a support on Wliicli'tlie dynamo is rotatablymounted and a guard spanning the point by which the dynamo is uphelt l?.in combination7 a car truck, a, genera tor, connecting means forsecuring said gen# eratoi' to said truck, and supplementary' meansassociated with said elements, noi;- inaily inoperative but adapted tocooperate with said truck upon failure of said connecting means.

18. The combination Wit-li a car truck., of a generator mounted thereon,driving means for said generator associated with said elements7 andmeans for maintaining substantially uniform tension of said drivingmeansupon changes in the relative proportions thereof.

in vWitness whereof i have hereunto set my hand, before two subscribingwitnesses. this 18th day of e`t 1inaiy7 1908.

JAMES F. MCELRY Vfitnesses 2 BEULAH @Amon ERNEST D. JANSEN.

